794628 SzGeCERN 20240223161156.0 oai:cds.cern.ch:794628 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-786 eng CERN-LHC-Project-Report-786 Bertarelli, A The Mechanical Design for the LHC Collimators 2004 Geneva CERN 17 Aug 2004 4 p paper The design of the LHC collimators must comply with the very demanding specifications entailed by the highly energetic beam handled in the LHC: these requirements impose a temperature on the collimating jaws not exceeding 50ºC in steady operations and an unparalleled overall geometrical stability of 25 micro-m on a 1200 mm span. At the same time, the design phase must meet the challenging deadlines required by the general time schedule. To respond to these tough and sometimes conflicting constraints, the chosen design appeals to a mixture of traditional and innovative technologies, largely drawing from LEP collimator experience. The specifications impose a low-Z material for the collimator jaws, directing the design towards such graphite or such novel materials as 3-d Carbon/carbon composites. An accurate mechanical design has allowed to considerably reduce mechanical play and optimize geometrical stability. Finally, all mechanical studies were supported by in-depth thermo-mechanical analysis concerning temperature distribution, mechanical strength and cooling efficiency. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN alignment CERN beam-losses CERN collimation CERN simulation CERN vacuum ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Aberle, O Assmann, R W Chiaveri, Enrico Kurtyka, T Mayer, M Perret, R Sievers, P LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project Report-786 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-786 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT008.PDF Published version from JACoW http://cds.cern.ch/record/794628/files/lhc-project-report-786.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200445 a2005 13 20100401 2001 CER01 20040924 646094 545 lucerne20040705 PUBLIC 002484395CER ARTICLE ConferencePaper 0001 794627 SzGeCERN 20240223161156.0 oai:cds.cern.ch:794627 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-785 eng CERN-LHC-Project-Report-785 CARE-Conf-04-005-HHH CARE-Conf-2004-005-HHH Brüning, Oliver Sim Performance Limits and IR Design Challenges of a Possible LHC Luminosity Upgrade Based on Nb-Ti SC Magnet Technology 2004 Geneva CERN 17 Aug 2004 4 p paper We investigate the maximum LHC performance for a standard IR design based on classical NbTi insertion magnets. We include in our analysis a ternary Nb-based ductile allow such as NbTi(Ta), a less developed but relatively cheap superconducting material which may allow to gain about 1 T in the peak field in the coils, and discuss the corresponding luminosity reach for a possible LHC upgrade compared to that based on Nb$_{3}$Sn magnets. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Devred, Arnaud Ostojic, R Rossi, L Ruggiero, F Scandale, Walter AUTHOR|(CDS)2107593 #BEARD# Taylor, T LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-785 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-785 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT030.PDF Published version from JACoW http://cds.cern.ch/record/794627/files/lhc-project-report-785.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200440 a2005 13 20100401 2001 CER01 20040924 646094 608 lucerne20040705 PUBLIC 002484394CER ARTICLE ConferencePaper 0001 794624 SzGeCERN 20240223161156.0 oai:cds.cern.ch:794624 cerncds:FULLTEXT cerncds:TALK INIS cerncds:CERN:FULLTEXT cerncds:TALK:FULLTEXT cerncds:CERN AgendaMaker a042767 LHC-Project-Report-784 eng CERN-LHC-Project-Report-784 Schmidt, R Machine Protection Issues and Strategies for the LHC 2004 Geneva CERN 17 Aug 2004 Streaming video ; 6 transparencies 720x576 4/3, 25 paper 06 Jul 2004 a042767 09:00:00.00 For nominal beam parameters at 7 TeV/c, each of the two LHC proton beams has a stored energy of 350 MJ threatening to damage accelerator equipment in case of uncontrolled beam loss. The energy stored in the magnet system at 7 TeV/c will exceed 10 GJ. In order to avoid damage of accelerator equipment, operation of the LHC will be strongly constrained. For the first commissioning of the complex magnet powering, quench protection and powering interlock systems must be fully operational. For safe injection, beam absorbers must be in the correct position and specific procedures for safe injection have to be applied. Since the beam dump blocks are the only element of the LHC that can withstand the impact of the full beam, it is essential that the beams are properly extracted onto the dump blocks at the end of a fill and in case of emergency. The time constants for failures leading to beam loss extend from some µs to few seconds. Requirements for safe operation throughout the cycle necessitate the use of beam instrumentation (mainly beam loss monitors), as well as collimators and beam absorbers. Failures must be detected sufficiently early and transmitted to the beam interlock system that triggers a beam dump. The strategy for the protection of the LHC will be illustrated starting from some typical failures. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 CERN EDS-AGE SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE LHCPROJECTREPORT CERN movingimages CERN LHC Not applicable Wenninger, J LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-784 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-784 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/TUXLH01.PDF Published version from JACoW http://agenda.cern.ch/fullAgenda.php?ida=a042767 Talk 06 Jul 2004 http://cds.cern.ch/record/794624/files/lhc-project-report-784.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200440 a2005 13 20100401 2001 CER01 20040924 646094 88 lucerne20040705 PUBLIC 002484359CER ARTICLE ConferencePaper 0001 793452 SzGeCERN 20240223161155.0 oai:cds.cern.ch:793452 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-782 eng CERN-LHC-Project-Report-782 Arduini, Gianluigi AUTHOR|(CDS)2051255 #BEARD# Accuracy of Profile Monitors and LHC Emittance Measurements 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 15:13:27 The monitoring and controlling of the beam transverse emittance is essential to allow high luminosity performances in a collider operation. The profile monitors in the LHC injection chain are exploited to determine their precision. A fit strategy was developed to reduce the fitting procedure error and make it negligible compared to instrumentation errors. The method proved to be robust against non-Gaussian tails and can estimate the fraction of non-Gaussian distributed beam intensity. The procedure was applied to the 2003 SPS Wire Scanner measurements with different kind of LHC type beams. The reproducibility of the six available monitors was determined by choosing one as a reference and making synchronized measurements. Several instrumental errors were discovered and corrected to the one per cent level. The demanding small LHC transverse emittances were determined under different beam conditions in terms of intensity, bunch spacing and length in the PS Booster, PS and SPS. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Dehning, Bernd CERN Ferioli, G Koopman, J Kramer, Daniel Roncarolo, F LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-782 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-782 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/THPLT015.PDF Published version from JACoW http://cds.cern.ch/record/793452/files/lhc-project-report-782.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200440 a2005 13 20100401 2001 CER01 20040918 646094 2496 lucerne20040705 PUBLIC 002483311CER ARTICLE ConferencePaper 0001 793451 SzGeCERN 20230531152426.0 oai:cds.cern.ch:793451 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-781 eng CERN-LHC-Project-Report-781 Holzer, E B Design of the Beam Loss Monitoring System for the LHC Ring 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 15:11:24 The beam loss monitoring (BLM) system of the LHC is one of the most critical elements for the protection of the LHC. It must prevent the super conducting magnets from quenches and the machine components from damages, caused by beam losses. It helps in the identification of the loss mechanism by measuring the loss pattern. Special detectors will be used for the setup and control of the collimators. Furthermore, it will be an important tool during machine setup and studies. The specification requirements of the BLM system include a very high reliability. CERN EDS SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN LHCPROJECTREPORT PREPRINT CERN LHC Not applicable Dehning, Bernd CERN Effinger, E Ferioli, G González, J L Gschwendtner, E Guaglio, Gianluca Hodgson, M Prieto, V Zamantzas, C LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-781 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-781 Access to fulltext document http://cds.cern.ch/record/793451/files/lhc-project-report-781.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200440 11 20100401 2001 CER01 20040927 PUBLIC 002483310CER PREPRINT 0001 793450 SzGeCERN 20230531152259.0 oai:cds.cern.ch:793450 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-780 eng CERN-LHC-Project-Report-780 Holzer, E B Longitudinal Beam Loss Distribution along the LHC Ring 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 15:09:41 For the design and calibration of the LHC beam loss monitoring (BLM) system it is essential to have good predictions of the expected longitudinal loss distributions. For this purpose, a complete and detailed aperture model of the LHC arc and dispersion suppressor (DS) was compiled and applied to the tracking of halo particles originating from the betatron cleaning insertion for proton and ion beams. The positions of all beam pipe bellows are included in the model as well. Therefore, it is possible to investigate the loss pattern due to misalignment effects, in addition to steady beam losses (beam halo, beam-beam and beam-rest gas interactions) and orbit errors. For proton beams the model was applied within the tracking code MAD-X [1]. Resulting loss maps are presented in this paper. The simulation for the ion beam halo is presented in [8]. The model served to identify critical loss positions. The implication of both simulations for the BLM design are discussed. CERN EDS SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN LHCPROJECTREPORT PREPRINT CERN LHC Not applicable Dehning, Bernd CERN LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-780 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-780 Access to fulltext document http://cds.cern.ch/record/793450/files/lhc-project-report-780.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200440 11 20100401 2001 CER01 20040927 PUBLIC 002483309CER PREPRINT 0001 793446 SzGeCERN 20240223161155.0 oai:cds.cern.ch:793446 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-779 eng CERN-LHC-Project-Report-779 Steinhagen, Ralph J LHC Orbit Feedback Tests at the SPS 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 15:06:58 The real-time orbit feedback system foreseen for the LHC will be an essential component for reliable and safe machine operation. A test setup including a number of beam position monitors equipped with the LHC acquisition and readout system have been installed in the SPS ring to perform prototyping work on such an orbit feedback. A closed loop digital feedback was implemented and tested with LHC beams on the SPS during the 2003 machine run. The feedback loop was tested successfully at up to 100 Hz. The performance of the feedback loop and of its constituents will be described. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Andersson, H Jensen, L K Jones, R Lamont, M Wenninger, J LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-779 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-779 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/THPLT016.PDF Published version from JACoW http://cds.cern.ch/record/793446/files/lhc-project-report-779.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200440 a2005 13 20100401 2001 CER01 20040918 646094 2499 lucerne20040705 PUBLIC 002483305CER ARTICLE ConferencePaper 0001 793438 SzGeCERN 20240223161146.0 oai:cds.cern.ch:793438 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-778 eng CERN-LHC-Project-Report-778 Wittmer, W Calculating LHC Tuning Knobs using Various Methods 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 15:03:26 By measuring and adjusting the beta-functions at the IP the luminosity is being optimized. In LEP this was done with the two closest doublet magnets. This approach is not applicable for the LHC due to the asymmetric lattice and common beam pipe through the triplet magnets. To control and change the beta-functions quadrupole groups situated on both sides further away from the IP have to be used where the two beams are already separated. The quadrupoles are excited in specific linear combinations, forming the socalled “tuning knobs” for the IP beta functions. We compare the performance of such knobs calculated by different methods: (1) matching in MAD, (2) inversion of the response matrix and singular value decomposition inversion and conditioning and (3) conditioning the response matrix by multidimensional minimization using an Adapted Moore Penrose Method. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Schulte, Daniel CERN AUTHOR|(CDS)2067943 #BEARD# Zimmermann, Frank CERN AUTHOR|(CDS)2067941 #BEARD# LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-778 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-778 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/TUPLT013.PDF Published version from JACoW http://cds.cern.ch/record/793438/files/lhc-project-report-778.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200440 a2005 13 20100401 2001 CER01 20040918 646094 1159 lucerne20040705 PUBLIC 002483297CER ARTICLE ConferencePaper 0001 793423 SzGeCERN 20240223161145.0 oai:cds.cern.ch:793423 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-777 eng CERN-LHC-Project-Report-777 CARE-Conf-04-034-HHH CARE-Conf-2004-034-HHH Koutchouk, Jean-Pierre Experiments on LHC Long-Range Beam-Beam Compensation in the CERN SPS 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 14:54:18 Long-range beam-beam collisions may limit the dynamic aperture and the beam lifetime in colliders. Their effect can be compensated by a current-carrying wire mounted parallel to the beam. A compensation scheme based on this principle has been proposed for the Large Hadron Collider (LHC). To demonstrate its viability, a prototype wire was installed at the CERN SPS in 2002. First successful machine experiments explored the dependence of beam loss, beam size, and beam lifetime on the beam-wire distance and on the wire excitation. They appear to confirm the predicted effect of the long-range collisions on the beam dynamics. In 2004, two further wires will become available, by which we can explicitly demonstrate the compensation, study pertinent tolerances, and also compare the respective merits of different beam-beam crossing schemes for several interaction points. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Wenninger, J Zimmermann, Frank CERN AUTHOR|(CDS)2067941 #BEARD# LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-777 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-777 Access to fulltext document http://documents.cern.ch/archive/electronic/other/uploader/CARE/Conf/care-conf-04-034.pdf Fulltext https://accelconf.web.cern.ch/e04/PAPERS/WEPLT045.PDF Published version from JACoW http://cds.cern.ch/record/793423/files/care-conf-04-034.pdf Fulltext http://cds.cern.ch/record/793423/files/lhc-project-report-777.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200440 a2005 13 20100401 2001 CER01 20040917 646094 1936 lucerne20040705 PUBLIC 002483248CER ARTICLE ConferencePaper 0001 792709 SzGeCERN 20240223161145.0 oai:cds.cern.ch:792709 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-776 eng CERN-LHC-Project-Report-776 Beuret, A The LHC Lead Injector Chain 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 14:33:06 A sizeable part of the LHC physics programme foresees lead-lead collisions with a design luminosity of 1027 cm-2 s-1. This will be achieved after an upgrade of the ion injector chain comprising Linac3, LEIR, PS and SPS machines [1,2]. Each LHC ring will be filled in 10 min by almost 600 bunches, each of 7×107 lead ions. Central to the scheme is the Low Energy Ion Ring (LEIR) [3,4], which transforms long pulses from Linac3 into high-brilliance bunches by means of multi-turn injection, electron cooling and accumulation. Major limitations along the chain, including space charge, intrabeam scattering, vacuum issues and emittance preservation are highlighted. The conversion from LEAR (Low Energy Antiproton Ring) to LEIR involves new magnets and power converters, high-current electron cooling, broadband RF cavities, and a UHV vacuum system with getter (NEG) coatings to achieve a few 10-12 mbar. Major hardware changes in Linac3 and the PS are also covered. An early ion scheme with fewer bunches (but each at nominal intensity) reduces the work required for early LHC ion operation in spring 2008. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Borburgh, J Blas, A Burkhardt, H Carli, Christian Chanel, M Fowler, A Gourber-Pace, M Hancock, S Hourican, M Hill, C E Jowett, John M Kahle, K Küchler, D Lombardi, A M Mahner, E Manglunki, Django AUTHOR|(CDS)2108503 #BEARD# Martini, M Maury, S Pedersen, F Raich, U Rossi, C Royer, J P Schindl, Karlheinz Scrivens, R Sermeus, L Shaposhnikova, Elena Tranquille, G Vretenar, Maurizio Zickler, T LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-776 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-776 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/TUPLT011.PDF Published version from JACoW http://cds.cern.ch/record/792709/files/lhc-project-report-776.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200440 a2005 13 20100401 2001 CER01 20040914 646094 1153 lucerne20040705 PUBLIC 002482688CER ARTICLE ConferencePaper 0001 791843 SzGeCERN 20230531152316.0 oai:cds.cern.ch:791843 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-775 eng CERN-LHC-Project-Report-775 Brüning, Oliver Sim Dynamic Aperture Reduction from the Dodecapole Component in the LHC Main Quadrupoles and its Mechanism 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 14:30:44 The systematic dodecapole component in the Main Quadrupoles of the LHC lattice has a strong influence on the machine dynamic aperture at injection. In this paper we quantify this effect with the help of tracking studies, explain the mechanism for the loss in dynamic aperture and look into potential correction schemes. Finally, we provide an estimate for the maximum allowed systematic dodecapole component in the MQ. CERN EDS SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN LHCPROJECTREPORT PREPRINT CERN LHC Not applicable Fartoukh, Stéphane David Lombardi, A M Risselada, Thys Schmidt, F Verdier, A LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-775 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-775 Access to fulltext document http://cds.cern.ch/record/791843/files/lhc-project-report-775.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200438 11 20100401 2001 CER01 20040917 PUBLIC 002481762CER PREPRINT 0001 791553 SzGeCERN 20240223161143.0 oai:cds.cern.ch:791553 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 5999820 Inspire 660104 LHC-Project-Report-774 eng CERN-LHC-Project-Report-774 Assmann, R W The New Layout of the LHC Cleaning Insertions 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 14:26:45 The improved LHC collimation system required significant changes in the layout and design of the warm insertions. Requirements for collimation, optics, impedance, vacuum, and additional infrastructure are described and the adopted layout is presented. Various design principles have been explored during the re-design. Magnet positions and collimators were moved significantly, such that a good cleaning efficiency was maintained while impedance was reduced by almost a factor of two. Space for upgrades of the collimation system was reserved (metallic phase 2 collimators would allow for a better efficiency than originally achievable). Scrapers were allocated for beam shaping and diagnostics. The required infrastructure was specified, including a powerful cooling system for the collimators. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Aberle, O Brüning, Oliver Sim Chemli, S Gasser, D Jeanneret, J B Jiménez, J M Kain, V Métral, Elias Peón-Hernández, G Ramberger, S Rathjen, C Risselada, Thys Ruggiero, F Vos, L Kaltchev, D I LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-774 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-774 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT006.PDF Published version from JACoW http://cds.cern.ch/record/791553/files/lhc-project-report-774.pdf Access to fulltext document Martine.Truchet@cern.ch CERN TRIUMF, Vancouver, Canada n 200437 a2005 13 20100901 1606 CER01 20040907 646094 539 lucerne20040705 PUBLIC 002481675CER ARTICLE ConferencePaper 0001 791552 SzGeCERN 20240223161143.0 oai:cds.cern.ch:791552 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 5999812 Inspire 660103 LHC-Project-Report-773 eng CERN-LHC-Project-Report-773 Assmann, R W An Improved Cllimation System for the LHC 2004 Geneva CERN 17 Aug 2004 3 p paper revised version submitted on 2004-09-23 14:21:12 The handling of the high-intensity LHC beams in a super-conducting environment requires a high-robustness collimation system with unprecedented cleaning efficiency. For gap closures down to 2.2 mm no beam instabilities must be induced from the collimator impedance. A difficult trade-off between collimator robustness, cleaning efficiency and collimator impedance is encountered. The conflicting LHC requirements are resolved with a phased approach, relying on low Z collimators for maximum robustness and hybrid metallic collimators for maximum performance. Efficiency is further enhanced with an additional cleaning close to the insertion triplets. The machine layouts have been adapted to the new requirements. The LHC collimation hardware is presently under design and has entered into the prototyping and early testing phase. Plans for collimator tests with beam are presented. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Aberle, O Bertarelli, A Braun, H Brugger, M Brüning, Oliver Sim Bruno, L Calatroni, S Chiaveri, Enrico Dehning, Bernd CERN Ferrari, A Goddard, B AUTHOR|(CDS)2108505 #BEARD# Holzer, E B Jeanneret, J B Jiménez, M Kain, V Lamont, M Mayer, M Métral, Elias Perret, R Redaelli, S Risselada, Thys Robert-Démolaize, G Sösler, S Ruggiero, F Schmidt, R Schulte, Daniel CERN AUTHOR|(CDS)2067943 #BEARD# Sievers, P Vlachoudis, V Vos, L Vossenberg, Eugène B CERN Wenninger, J Ajguirei, I L Baishev, I S Kurochkin, I Tsutsui, H Kaltchev, D I LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-773 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-773 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT005.PDF Published version from JACoW http://cds.cern.ch/record/791552/files/lhc-project-report-773.pdf Access to fulltext document Martine.Truchet@cern.ch CERN IHEP, Russia Sumitomo Heavy Industries, Ltd, Japan TRIUMF, Vancouver, Canada n 200437 a2005 13 20100901 1606 CER01 20040907 646094 536 lucerne20040705 PUBLIC 002481672CER ARTICLE ConferencePaper 0001 791378 SzGeCERN 20240223161143.0 oai:cds.cern.ch:791378 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 5999804 Inspire 660102 LHC-Project-Report-772 eng CERN-LHC-Project-Report-772 Jowett, John M Limits to the Performance of the LHC with Ion Beams 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-10-21 11:24:16 The performance of the LHC as a heavy-ion collider will be limited by a diverse range of phenomena that are often qualitatively different from those limiting the performance with protons. We summarise the latest understanding and results concerning the consequences of nuclear electromagnetic processes in lead ion collisions, the interactions of ions with the residual gas and the effects of lost ions on the beam environment and vacuum. Besides these limitations on beam intensity, lifetime and luminosity, performance will be governed by the evolution of the beam emittances under the influences of synchrotron radiation damping, intra-beam scattering, RF noise and multiple scattering on residual gas. These effects constrain beam parameters in the LHC ring throughout the operational cycle with lead ions. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Braun, Hans Heinrich CERN Gresham, M I Mahner, E Nicholson, A N Shaposhnikova, Elena Pshenichnov, I A LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-772 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-772 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT020.PDF Published version from JACoW http://cds.cern.ch/record/791378/files/lhc-project-report-772.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN JINR, Moscow n 200437 a2005 13 20100901 1606 CER01 20040906 646094 578 lucerne20040705 PUBLIC 002481478CER ARTICLE ConferencePaper 0001 791375 SzGeCERN 20240223161142.0 oai:cds.cern.ch:791375 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 5999790 Inspire 660101 LHC-Project-Report-771 eng CERN-LHC-Project-Report-771 Brüning, Oliver Sim Numerical Studies of the Impact of the Separation Dipoles and Insertion Quadrupoles Field Quality on the Dynamic Aperture of the CERN LHC 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 14:16:08 A wide range of magnets, both warm and superconducting, will be used in the LHC. In addition to main dipoles, quadrupoles are used to focus the beam in regular arcs. Special dipoles separate or merge the two beams in insertion regions. A few very strong superconducting quadrupoles squeeze the beam to achieve the required luminosity, while warm quadrupoles are used in the collimation insertions. At injection the main dipoles largely dominate beam dynamics, but contributions from smaller classes of magnets should not be neglected. Peculiar optical configurations may dramatically enhance beam dynamics effects of a few magnetic elements. This paper will focus on the effect of insertion quadrupoles, e.g. wide-aperture, and warm quadrupoles, as well as separation dipoles on the dynamic aperture of the LHC machine. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Fartoukh, Stéphane David Giovannozzi, Massimo AUTHOR|(CDS)2051254 #BEARD# Risselada, Thys Schmidt, F LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-771 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-771 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/WEPLT017.PDF Published version from JACoW http://cds.cern.ch/record/791375/files/lhc-project-report-771.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200437 a2005 13 20100901 1606 CER01 20040906 646094 1858 lucerne20040705 PUBLIC 002481452CER ARTICLE ConferencePaper 0001 791374 SzGeCERN 20240223161142.0 oai:cds.cern.ch:791374 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 5999782 Inspire 660100 LHC-Project-Report-770 eng CERN-LHC-Project-Report-770 Faus-Golfe, A High-$\beta$ and very high-$\beta$ optics for LHC 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 14:13:17 New high-beta and very high-betaoptics have been sought in order to find the best possible configuration for measuring elastic scattering at the LHC. They are based on the nominal powering scheme of the low-b triplet. A list of the various possible solution is given in this report. A particularly interesting solution has been found for a case where the phase advances in both planes at the detector are close to pi/2. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Verdier, A LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-770 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-770 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT050.PDF Published version from JACoW http://cds.cern.ch/record/791374/files/lhc-project-report-770.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN CSIC-Univ. of Valencia n 200437 a2005 13 20100901 1606 CER01 20040906 646094 662 lucerne20040705 PUBLIC 002481448CER ARTICLE ConferencePaper 0001 791373 0001 20060419 1613 CER01 20040907 002481447CER UNKNOWN DELETED 791209 SzGeCERN 20240223161141.0 oai:cds.cern.ch:791209 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 5999766 Inspire 660098 LHC-Project-Report-768 eng CERN-LHC-Project-Report-768 Burkhardt, H Collimation in the Transfer Lines to the LHC rev. version 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 14:06:21 The intensities foreseen for injection into the LHC are over an order of magnitude above the expected damage levels. The TI 2 and TI 8 transfer lines between the SPS and LHC are each about 2.5 km long and comprise many magnet families. Despite planned power supply surveillance and interlocks, failure modes exist which could result in uncontrolled beam loss and serious transfer line or LHC equipment damage. We describe the collimation system in the transfer lines that has been designed to provide passive protection against damage at injection. Results of simulations to develop a conceptual design are presented. The optical and physical installation constraints are described, and the resulting element locations and expected system performance presented, in terms of the phase space coverage, local element temperature rises and the characteristics of the beam transmitted into the LHC. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Goddard, B AUTHOR|(CDS)2108505 #BEARD# Kadi, Y Kain, V Weterings, W LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-768 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-768 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT012.PDF Published version from JACoW http://cds.cern.ch/record/791209/files/lhc-project-report-768.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200437 a2005 13 20100901 1606 CER01 20040906 646094 554 lucerne20040705 PUBLIC 002481443CER ARTICLE ConferencePaper 0001 790662 SzGeCERN 20240223161141.0 oai:cds.cern.ch:790662 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-767 eng CERN-LHC-Project-Report-767 Benedetto, Elena AUTHOR|(CDS)2068441 #BEARD# Simulated Emittance Growth due to Electron Cloud for SPS and LHC 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 14:01:07 The emittance growth caused by an electron cloud is simulated by the HEADTAIL code with conducting boundary conditions. Under some conditions the simulation results may depend on the number of beam-cloud interaction points, the phase advance between them and the number of macroparticles used to represent beam and cloud. Simulations include a transverse feedback system and, optionally, a large chromaticity, as employed in actual SPS operation. Simulation results for the SPS can be compared with observations, and the emittance growth in the LHC is computed as a function of average electron density. An attempt is made to extrapolate to low electron densities. We also compare the initial instability rise times with those obtained for an equivalent broadband resonator. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Rumolo, Giovanni AUTHOR|(CDS)2069325 #BEARD# Schulte, Daniel CERN AUTHOR|(CDS)2067943 #BEARD# Zimmermann, Frank CERN AUTHOR|(CDS)2067941 #BEARD# LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-767 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-767 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/WEPLT008.PDF Published version from JACoW http://cds.cern.ch/record/790662/files/lhc-project-report-767.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN GSI n 200437 a2005 13 20100401 2001 CER01 20040903 646094 1831 lucerne20040705 PUBLIC 002481284CER ARTICLE ConferencePaper 0001 790656 SzGeCERN 20240223161132.0 oai:cds.cern.ch:790656 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-766 eng CERN-LHC-Project-Report-766 Assmann, R W Collimation of Heavy Ion Beams in LHC 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 13:50:24 The LHC collimation system is designed to cope with requirements of proton beams having 100 times higher beam power than the nominal LHC heavy ion beam. In spite of this, specific problems occur for ion collimation, due to different particle-collimator interaction mechanism for ions and protons. Ions are subject to hadronic fragmentation and electromagnetic dissociation, resulting in a non-negligible flux of secondary particles of small angle divergence and Z/A ratios slightly different from the primary beam. These particles are difficult to intercept by the collimation system and can produce significant heat-load in the superconducting magnets when they hit the magnet vacuum chamber. A computer program has been developed to obtain quantitative estimates of the magnitude and location of the particle losses. Hadronic fragmentation and electromagnetic dissociation of ions in the collimators were considered within the frameworks of abrasion-ablation and RELDIS models, respectively. Trajectories of the secondary particles in the ring magnet lattice and the distribution of intercept points of these trajectories with the vacuum chamber are computed. Results are given for the present collimation system design and potential improvements are discussed. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Braun, Hans Heinrich CERN Ferrari, A Jowett, John M Jeanneret, J B Pshenichnov, I A LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-766 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-766 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT010.PDF Published version from JACoW http://cds.cern.ch/record/790656/files/lhc-project-report-766.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN INR, Moscow n 200437 a2005 13 20100401 2001 CER01 20040902 646094 551 lucerne20040705 PUBLIC 002481159CER ARTICLE ConferencePaper 0001 790611 SzGeCERN 20230531152013.0 oai:cds.cern.ch:790611 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-765 eng CERN-LHC-Project-Report-765 Bohl, T CERN Capture loss of the LHC beam in the CERN SPS 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 13:46:50 The dependence of energy loss on bunch length was determined experimentally for a single proton bunch in the SPS at 26 GeV/c. This was done from measurements of the synchronous phase as a function of intensity for different capture voltages. The results are compared with the expected dependence calculated from the resistive part of the SPS impedance below 1 GHz. Two impedance sources, the cavities of the 200 MHz RF system and the extraction kickers, give the main contributions to particle energy loss in very good agreement with experiment. The results obtained allow a better understanding of some mechanisms leading to capture loss of the high intensity LHC beam in the SPS. CERN EDS SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN LHCPROJECTREPORT PREPRINT CERN LHC Not applicable Linnecar, Trevor Paul R Shaposhnikova, Elena Tückmantel, Joachim LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-765 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-765 Access to fulltext document http://cds.cern.ch/record/790611/files/lhc-project-report-765.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200437 11 20100401 2001 CER01 20040907 PUBLIC 002480741CER PREPRINT 0001 790610 SzGeCERN 20240223161131.0 oai:cds.cern.ch:790610 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-764 eng CERN-LHC-Project-Report-764 Caspers, Friedhelm Coupler Structures for the LHC Beam Pipe Waveguide Mode Reflectometer 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 11:58:55 The LHC reflectometer will be used to detect and localise obstacles and other kinds of discontinuities in the LHC beam screen. An important part of this device is the RF coupler element, which provides the interface between the beam screen and the measurement equipment. Two different scenarios of operation are considered. The first option consists in carrying out measurements during assembly by directly branching a coupler to the end of the beam screen. The second one is a permanent installation to be used in situ requiring a different kind of coupler to keep the aperture free. The goal is to achieve a reasonably well matched spurious mode-free excitation over a 25% bandwidth for the TM01 and the TEc11 mode1, respectively. The fulfillment of the required features is severely complicated by space and material restrictions arising mainly from vacuum and installation constraints. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Kroyer, T Wien, T U LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-764 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-764 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/THPLT014.PDF Published version from JACoW http://cds.cern.ch/record/790610/files/lhc-project-report-764.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200437 a2005 13 20100401 2001 CER01 20040831 646094 2493 lucerne20040705 PUBLIC 002480740CER ARTICLE ConferencePaper 0001 790609 SzGeCERN 20240223161131.0 oai:cds.cern.ch:790609 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-763 eng CERN-LHC-Project-Report-763 Fartoukh, Stéphane David LHC Abort Gap Filling by Proton Beam 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 11:55:00 Safe operation of the LHC beam dump relies on the possibility of firing the abort kicker at any moment during beam operation. One of the necessary conditions for this is that the number of particles in the abort gap should be below some critical level defined by quench limits. Various scenarios can lead to particles filling the abort gap. Time scales associated with these scenarios are estimated for injection energy and also coast where synchrotron radiation losses are not negligible for uncaptured particle motion. Two cases are considered, with RF on and RF off. The equilibrium distribution of lost particles in the abort gap defines the requirements for maximum tolerable relative loss rate and as a consequence the minimum acceptable longitudinal lifetime of the proton beam in collision. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Jeanneret, Jean Bernard Shaposhnikova, Elena LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-763 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-763 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT031.PDF Published version from JACoW http://cds.cern.ch/record/790609/files/lhc-project-report-763.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200437 a2005 13 20100401 2001 CER01 20040831 646094 611 lucerne20040705 PUBLIC 002480739CER ARTICLE ConferencePaper 0001 790608 SzGeCERN 20240223161131.0 oai:cds.cern.ch:790608 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-762 eng CERN-LHC-Project-Report-762 Damerau, H Proposal for the Creation and Storage of Long Bunches in the LHC 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 11:52:51 Long bunches with a uniform longitudinal line density held by barrier buckets are considered for a future luminosity upgrade of the Large Hadron Collider (LHC). With such bunches, the luminosity is maximized for a fixed number of particles. Instead of conventional barrier buckets, periodic barriers are proposed. These are generated with multiple RF harmonics (e.g. multiples of 40 MHz). A possible scheme to create and hold long flat bunches in the LHC is described, and the resulting gain in luminosity is estimated. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Garoby, R LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-762 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-762 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/WEPLT015.PDF Published version from JACoW http://cds.cern.ch/record/790608/files/lhc-project-report-762.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200437 a2005 13 20100401 2001 CER01 20040831 646094 1852 lucerne20040705 PUBLIC 002480737CER ARTICLE ConferencePaper 0001 790607 SzGeCERN 20240223161131.0 oai:cds.cern.ch:790607 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-761 eng CERN-LHC-Project-Report-761 Bohl, T CERN Experimental Studies of Controlled Longitudinal Emittance Blow-up in the SPS as LHC Injector and LHC Test-Bed 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 11:50:00 The longitudinal emittance of the LHC beam must be increased in a controlled way in both the SPS and the LHC itself. In the first case a small increase is sufficient to help prevent coupled-bunch instabilities but in the second a factor three is required to also reduce intra-beam scattering effects. This has been achieved in the SPS by exciting the beam at the synchrotron frequency through the phase loop of the main RF system using bandwidthlimited noise, a method that is particularly suitable for the LHC which will have only one RF system. We describe the tests that have been done in the SPS both for low- and high-intensity beams, the hardware used and the influence of parameters such as time of excitation, bandwidth, frequency and amplitude on the resulting blow-up. After taking into account intensity effects it was possible to achieve a controlled emittance increase by a factor of about 2.5 without particle loss or the creation of visible tails in the distribution. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Linnecar, Trevor Paul R Tückmantel, Joachim Shaposhnikova, Elena LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-761 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-761 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT033.PDF Published version from JACoW http://cds.cern.ch/record/790607/files/lhc-project-report-761.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200437 a2005 13 20100401 2001 CER01 20040831 646094 617 lucerne20040705 PUBLIC 002480736CER ARTICLE ConferencePaper 0001 790606 SzGeCERN 20240223161131.0 oai:cds.cern.ch:790606 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-760 eng CERN-LHC-Project-Report-760 Arnaudon, L Control of the LHC 400 MHz RF System (ACS) 2004 Geneva CERN 17 Aug 2004 4 p revised version submitted on 2004-09-23 11:37:44 The LHC ACS RF system is composed of 16 superconducting cavities, eight per ring. Each ring has two cryomodules, each containing four cavities. Each cavity is powered by a 300 kW klystron. The klystrons are grouped in fours, the klystrons in each group sharing a common 58 kV power converter and HV equipment bunker. The ACS RF control system is based on modern industrial programmable controllers (PLCs). A new fast interlock and alarm system with inbuilt diagnostics has been developed. Extensive use of the FIPIO Fieldbus drastically decreases the cabling complexity and brings improved signal quality, increased reliability and easier maintenance. Features of the implementation, such as system layout, communication and the high-level software interface are described. Operational facilities such as the automatic switch on procedure are described, as well as the necessary specialist tools and interfaces. A complete RF chain, including high voltage, cryomodule and klystron is presently being assembled in order to check, as far as possible, all aspects of RF system operation before LHC installation. The experience gained so far in this test chain with the new control system is presented. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Disdier, M Maesen, P Prax, M LHC http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-760 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT004.PDF Published version from JACoW http://cds.cern.ch/record/790606/files/lhc-project-report-760.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200437 a2005 13 20100401 2001 CER01 20040831 646094 533 lucerne20040705 PUBLIC 002480735CER ARTICLE ConferencePaper 790605 SzGeCERN 20230531152125.0 oai:cds.cern.ch:790605 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-759 eng CERN-LHC-Project-Report-759 Höfle, Wolfgang Experience Gained in the SPS for the Future LHC Abort Gap Cleaning 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 11:24:50 Abort gap cleaning using a transverse damper (feedback) has been previously shown in the RHIC accelerator [1]. We report on experimental results in the SPS [2], where the transverse damper was used to excite transverse oscillations on part of an LHC test beam and, by the induced losses, to create a practically particle free zone. It is proposed to use the same principle for abort gap cleaning in the LHC. For the LHC accelerator, abort gap cleaning may be required at injection energy, during the ramp and at top energy [3]. The transverse excitation can be optimized taking into account the actual bandwidth of the damper systems and the possibility to fully modulate their input signal to match the beam betatron tune distribution. CERN EDS SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN LHCPROJECTREPORT PREPRINT CERN LHC Not applicable LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-759 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-759 Access to fulltext document http://cds.cern.ch/record/790605/files/lhc-project-report-759.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200437 11 20100401 2001 CER01 20040906 PUBLIC 002480734CER PREPRINT 0001 790604 SzGeCERN 20240223161131.0 oai:cds.cern.ch:790604 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-758 eng CERN-LHC-Project-Report-758 Assmann, R W Expected Performance and Beam-Based Optimization of the LHC Collimation System 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 13:56:05 The cleaning efficiency requirements in the LHC are beyond the requirements at other circular colliders. The achievable ideal cleaning efficiency in the LHC is presented for the improved LHC collimation system. The longitudinal distribution of proton losses is evaluated with a realistic aperture model of the LHC. The results from simplified tracking studies are compared to simulations with complete physics and error models. Possibilities for beambased optimization of collimator settings are described. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Holzer, E Jeanneret, J B Kain, V Redaelli, S Robert-Démolaize, G Wenninger, J LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-758 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-758 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/WEPLT006.PDF Published version from JACoW http://cds.cern.ch/record/790604/files/lhc-project-report-758.pdf Access to fulltext document Martine.Truchet@cern.ch CERN n 200437 a2005 13 20100401 2001 CER01 20040831 646094 1825 lucerne20040705 PUBLIC 002480733CER ARTICLE ConferencePaper 0001 791208 SzGeCERN 20240223161141.0 oai:cds.cern.ch:791208 INIS cerncds:CERN LHC-Project-Report-757 eng CERN-LHC-Project-Report-757 Chiaveri, Enrico Industrial Production of the eight normal-conducting 200 MHz ACN cavities for the LHC 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 11:18:59 The LHC-ACN RF system consists of 8 normalconducting cavities and is designed to reduce beam losses in the LHC when injecting beams with longitudinal emittance > 0.7 eVs from the CERN SPS. The cavity design took into account the possibility of recuperating all the "ancillary" equipment (tuners, fundamental mode damper, High Order Mode (HOM) couplers) from the old CERN SPS 200MHz system. The cavities are made from OFE copper. The original ingots, procured in Austria, have been forged and pre-formed by pressing them with a 20 tons press, following a procedure defined and adapted for the unusual dimensions of these pieces. The raw components thus obtained were machined and then welded together with an electron beam. In order to get a good repeatability of the fundamental mode frequency across the eight cavities, a procedure has been established with the contractor for the final machining and welding leading to a spread in frequencies below ±20 kHz (< 0.01%). The cavities will be installed in the LHC when losses at high intensities become significant. In the meantime they are undergoing a surface treatment to clean the RF surface and will be stored. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Hanni, R Linnecar, Trevor Paul R Losito, R Marque, S Tückmantel, Joachim LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-757 https://accelconf.web.cern.ch/e04/PAPERS/TUPKF003.PDF Published version from JACoW Lidia.Ghilardi@cern.ch CERN n 200437 a2005 13 20100401 2001 CER01 20040906 646094 956 lucerne20040705 PUBLIC 002481442CER ARTICLE ConferencePaper 0001 789994 SzGeCERN 20240223161129.0 oai:cds.cern.ch:789994 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-756 eng CERN-LHC-Project-Report-756 Goddard, B AUTHOR|(CDS)2108505 #BEARD# Conceptual Design of the LHC Beam Dumping Protection Elements TCDS and TCDQ 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 11:15:21 The Beam Dumping System for the Large Hadron Collider, presently under construction at CERN, consists, per ring, of a set of horizontally deflecting extraction kicker magnets, vertically deflecting steel septa, dilution kickers and finally, a couple of hundred metres further downstream, an absorber block. A fixed diluter (TCDS) will protect the septa in the event of a beam dump that is not synchronised with the particle free gap or a spontaneous firing of the extraction kickers which will cause the beam to sweep over the septum. Another, mobile, diluter block (TCDQ) will protect the superconducting quadrupole immediate downstream of the extraction as well as the arc at injection energy and the triplet aperture at top energy from bunches with small impact parameters. This paper describes the conceptual design of the protection elements. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Riffaud, R Sans-Merce, M Weterings, W LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-756 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-756 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT038.PDF Published version from JACoW http://cds.cern.ch/record/789994/files/lhc-project-report-756.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200437 a2005 13 20100401 2001 CER01 20040824 646094 629 lucerne20040705 PUBLIC 002479997CER ARTICLE ConferencePaper 0001 789786 SzGeCERN 20240223161129.0 oai:cds.cern.ch:789786 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-755 eng CERN-LHC-Project-Report-755 Filippini, R Possible Causes and Consequences of Serious Failures of the LHC Machine Protection Systems 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 11:13:32 The LHC machine protection systems, including the beam dumping system, are designed to ensure that failures leading to serious damage to the LHC during its lifetime are extremely unlikely. These kind of failures, for instance requiring a combination of equipment failure and surveillance failure, have to date been considered as being 'beyond the design case'. However, their consequences need to be evaluated to determine the required safety levels of the protection systems. A second objective is to understand if measures can and should be taken to further reduce the probability of such failures, or to minimise their impact. This paper considers various serious failure modes of the different machine protection systems. The probable consequences and possible ameliorating measures of the worst-case scenarios are discussed. The particular case of having a stored beam with an unavailable beam dumping system is mentioned, together with possible actions to be taken in such an event. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Goddard, B AUTHOR|(CDS)2108505 #BEARD# Gyr, Marcel Kain, V Schmidt, R Uythoven, J Wenninger, J LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-755 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-755 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT034.PDF Published version from JACoW http://cds.cern.ch/record/789786/files/lhc-project-report-755.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200437 a2005 13 20100401 2001 CER01 20040824 646094 620 lucerne20040705 PUBLIC 002479995CER ARTICLE ConferencePaper 0001 789785 SzGeCERN 20240223161129.0 oai:cds.cern.ch:789785 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-754 eng CERN-LHC-Project-Report-754 Carlier, E Reliability Issues on the LHC Beam Dumping System 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 11:11:46 The Beam Dumping System of the Large Hadron Collider, presently under construction at CERN, must function with utmost reliability to protect the personnel, minimize the risk of severe damage to the machine and avoid undue impact to the environment. The dumping action must be synchronized with the particle free gap and the field of the extraction and dilution elements must be well adjusted to the beam energy. The measures taken to arrive at a reliable and safe system will be described, like the adoption of fault tolerant design principles and other safety related features as comprehensive monitoring, diagnostics and protection facilities. These issues will be discussed in the general framework of the IEC standard recommendations for safety critical systems. Some examples related to the most critical functions will be included. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Filippini, R Goddard, B AUTHOR|(CDS)2108505 #BEARD# Uythoven, J LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-754 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-754 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT015.PDF Published version from JACoW http://cds.cern.ch/record/789785/files/lhc-project-report-754.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200437 a2005 13 20100401 2001 CER01 20040824 646094 563 lucerne20040705 PUBLIC 002479994CER ARTICLE ConferencePaper 0001 789784 SzGeCERN 20240223161129.0 oai:cds.cern.ch:789784 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-753 eng CERN-LHC-Project-Report-753 Goddard, B AUTHOR|(CDS)2108505 #BEARD# Aperture and Delivery Precision of the LHC Injection System 2004 Geneva CERN 17 Aug 2004 4 p paper revised version submitted on 2004-09-23 11:07:49 The main LHC injection elements in interaction regions 2 and 8 comprise the injection septa (MSI), the injection kickers (MKI), together with three families of passive protection devices (TDI, TCDD and TCLI). The apertures of the two circulating beams are detailed for these elements, together with a summary of recent design modifications. The errors in the SPS, the transfer lines and the injection system are analysed, and the expected performance of the system derived, in terms of the expected delivery precision of the injected beam. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Gyr, Marcel Jeanneret, J B Kain, V Lamont, M Maire, V Mertens, V Wenninger, J LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-753 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-753 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT018.PDF Published version from JACoW http://cds.cern.ch/record/789784/files/lhc-project-report-753.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200436 a2005 13 20100401 2001 CER01 20040824 646094 572 lucerne20040705 PUBLIC 002479991CER ARTICLE ConferencePaper 0001 789783 SzGeCERN 20240223161129.0 oai:cds.cern.ch:789783 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-752 eng CERN-LHC-Project-Report-752 Borburgh, J The Design of the New Fast Extraction Channel for the LHC 2004 Geneva CERN 2004 4 p paper revised version submitted on 2004-09-23 11:05:55 The Large Hadron Collider (LHC) project requires the modification of the existing extraction channel in the long straight section 6 of the CERN Super Proton Synchrotron (SPS). The new extraction will be used to transfer protons at 450 GeV/c as well as ions via the 2.8 km long transfer line TI 2 to the clockwise ring of the LHC. As the resonant extraction to the present SPS West Area will be stopped after 2004, the electrostatic septa will be replaced by new fast extraction kicker magnets. The girder for the existing DC septa will be modified to accommodate a new septum protection element. Other modifications concern the replacement of a machine quadrupole, a new scheme for the extraction bumpers, new instrumentation and interlocks. The requirements and the design of the new extraction channel will be described as well as the modifications which will mainly be carried out in the long SPS shutdown 2005. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Balhan, B Gaxiola, E Goddard, B AUTHOR|(CDS)2108505 #BEARD# Kadi, Y Uythoven, J LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-752 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-752 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT009.PDF Published version from JACoW http://cds.cern.ch/record/789783/files/lhc-project-report-752.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200436 a2005 13 20100401 2001 CER01 20040824 646094 548 lucerne20040705 PUBLIC 002479987CER ARTICLE ConferencePaper 0001 789329 SzGeCERN 20240223161128.0 oai:cds.cern.ch:789329 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 5973600 Inspire 657760 LHC-Project-Report-751 eng CERN-LHC-Project-Report-751 Goddard, B AUTHOR|(CDS)2108505 #BEARD# Status and Plans for the SPS to LHC Beam Transfer Lines TI 2 and TI 8 2004 Geneva CERN 2004 4 p paper revised version submitted on 2004-09-23 11:03:52 Beam transfer from the CERN Super Proton Synchrotron (SPS) to the Large Hadron Collider (LHC) will be done through the two transfer lines TI 2 and TI 8, presently under construction, with a combined length of about 5.6 km. The final layout, optics design and correction scheme for these lines will be presented. The requirement of simultaneously matching their geometry and optics with that of the LHC will be treated, including the methodology for alignment of the elements along the line and a proposed solution in the final matching section. After the commissioning of the short transfer line TT40 just upstream of TI 8 in 2003, beam tests of the whole of TI 8 are scheduled for autumn 2004, with the aim to validate many of the new features and mechanisms involved in the future control and operation of these lines. The status of the installation will be described, comprising the progress with infrastructure, services and line elements. An outlook will be given for the work remaining until 2007. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Mertens, V Risselada, Thys LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-751 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-751 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT025.PDF Published version from JACoW http://cds.cern.ch/record/789329/files/lhc-project-report-751.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200435 a2005 13 20100901 1606 CER01 20040819 646094 593 lucerne20040705 PUBLIC 002479480CER ARTICLE ConferencePaper 0001 789322 SzGeCERN 20240223161128.0 oai:cds.cern.ch:789322 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 5973597 Inspire 657759 LHC-Project-Report-750 eng CERN-LHC-Project-Report-750 Kadi, Y Attenuation and Emittance Growth of 450 GeV and 7 TeV Proton Beams in Low-Z Absorber Elements 2004 Geneva CERN 2004 4 p paper revised version submitted on 2004-09-23 10:57:34 The intensity of the LHC beams will be several orders of magnitude above the damage thresholds for equipment. Passive protection of accelerator equipment against failures during beam transfer, injection and dumping of the beam with diluters and collimators is foreseen. These protection devices must be robust in case of beam impact, and low-Z materials such as carbon are favored. In these diluters, the reduction of the energy density is determined both by the attenuation due to inelastic nuclear collisions and by the emittance growth of the surviving protons due to elastic scattering processes. The physics principles leading to attenuation and emittance growth for a hadron beam traversing matter are summarised, and FLUKA simulation results for 450 GeV and 7 TeV proton beams on low-Z absorbers are compared with these predictions. Design criteria for the LHC absorbers are derived from these results. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Kain, V Goddard, B AUTHOR|(CDS)2108505 #BEARD# Schmidt, R LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-750 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-750 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT021.PDF Published version from JACoW http://cds.cern.ch/record/789322/files/lhc-project-report-750.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200435 a2005 13 20100901 1606 CER01 20040819 646094 581 lucerne20040705 PUBLIC 002479478CER ARTICLE ConferencePaper 0001 789321 SzGeCERN 20240223161128.0 oai:cds.cern.ch:789321 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 5973589 Inspire 657758 LHC-Project-Report-749 eng CERN-LHC-Project-Report-749 Goddard, B AUTHOR|(CDS)2108505 #BEARD# Detecting Failures in Electrical Circuits Leading to Very Fast Beams Losses in the LHC 2004 Geneva CERN 2004 4 p paper revised version submitted on 2004-09-23 10:55:35 Failures in the powering of LHC magnets could lead to very fast beam losses at collimators, possibly within less than 10 turns. Beam loss monitors would normally detect such losses and trigger a beam dump. However, the available time for detection with these monitors before reaching the damage level of a collimator might not be sufficient, in particular for beams with few particles in the tail of the transverse particle distribution. This has always been of concern and becomes even more relevant since very fast losses have been observed recently at HERA. In this paper, we present particle tracking studies for the LHC to identify failures of critical magnets in the accelerator. We propose a fast detection of such failures in the electrical circuit, either with highly precise hall probes for current measurement or measurements of the induced inductive voltage during the current decay. Where active detection is not possible, additional inductance in series with the electrical circuit can relax the time constraints for a safe detection of the failure. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Kain, V Schmidt, R Zerlauth, M LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-749 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-749 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/WEPLT043.PDF Published version from JACoW http://cds.cern.ch/record/789321/files/lhc-project-report-749.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200435 a2005 13 20100901 1606 CER01 20040819 646094 1930 lucerne20040705 PUBLIC 002479477CER ARTICLE ConferencePaper 0001 788801 SzGeCERN 20240223161127.0 oai:cds.cern.ch:788801 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 5973570 Inspire 657757 LHC-Project-Report-748 eng CERN-LHC-Project-Report-748 Fortov, V E Interaction of the CERN Large Hadron Collider (LHC) Beam with Solid Metallic Targets 2004 Geneva CERN 2004 4 p paper revised version submitted on 2004-09-23 10:53:07 The LHC will operate at an energy of 7 TeV with a luminosity of 1034cm_2s_1. This requires two beams, each with 2808 bunches. The nominal intensity per bunch is 1.1 · 1011 protons. The energy stored in each beam is about 350 MJ, sufficient to heat and melt 500 kg of copper. Protection of machine equipment in the presence of such powerful beams is essential [1]. In this paper a specific failure of the protection system is discussed, resulting in the full beam accidentally being directed towards the accelerator equipment [2]. We carried out two-dimensional hydrodynamic simulations of the heating of a solid copper block with a face area of 2 cm x 2 cm, which is irradiated by the LHC beam with nominal parameters. With the present simulations we estimate that after an impact of about 100 bunches the beam heated region has expanded drastically and the density in the inner 0.5 mm decreases by about a factor of 10. The bulk of the following beam will not be absorbed and continue to tunnel further and further into the target. The results will allow estimating the length of a sacrificial absorber presently under discussion. A very interesting ”spinoff” from this work would be the study of high-energy-density states of matter induced by the LHC beam, because a specific energy deposition of 200 kJ/g is achieved after 2.5 µs. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Goddard, B AUTHOR|(CDS)2108505 #BEARD# Hoffmann, Dieter H H Kain, V Lomonosov, I V Piriz, A R Schmidt, R Shutov, A Tahir, N A Temporal, M LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-748 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-748 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT042.PDF Published version from JACoW http://cds.cern.ch/record/788801/files/lhc-project-report-748.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200435 a2005 13 20100901 1606 CER01 20040817 646094 641 lucerne20040705 PUBLIC 002479198CER ARTICLE ConferencePaper 0001 788799 SzGeCERN 20230531152428.0 oai:cds.cern.ch:788799 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN LHC-Project-Report-747 eng CERN-LHC-Project-Report-747 Billan, J Magnetic Measurement Systems for the LHC Dipole Assembly Companies 2004 Geneva CERN 2004 4 p paper revised version submitted on 2004-09-23 10:50:43 The LHC superconducting lattice dipole magnets are presently under construction in three European industries. Due to the stringent magnet performance required for the LHC, these magnets have to be built with high accuracy during all the steps of their assembly. In order to detect defects in the earliest industrial production phases and to ensure the quality of the magnetic field as specified by the CERN contracts, dedicated measurement benches have been built and installed in each assembly company to validate the magnetic field quality at two important production stages: the collared coils and the final cold mass. This paper describes the initial requirements and the implementation of the magnetic measurement systems. Details on the technical solutions, the present status and measurement results are presented. CERN EDS SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN LHCPROJECTREPORT PREPRINT CERN LHC Not applicable García-Pérez, J Giloteaux, D Raimondo, A Remondino, Vittorio Reymond, H Rijllart, A LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-747 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-747 Access to fulltext document http://cds.cern.ch/record/788799/files/lhc-project-report-747.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200435 11 20100401 2001 CER01 20040823 PUBLIC 002479191CER PREPRINT 0001 788781 SzGeCERN 20240223161126.0 oai:cds.cern.ch:788781 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN SPIRES 5973554 Inspire 657755 LHC-Project-Report-746 eng CERN-LHC-Project-Report-746 Kain, V The Expected Performance of the LHC Injection Protection System 2004 Geneva CERN 2004 4 p paper revised version submitted on 2004-09-23 10:48:42 The passive protection devices TDI, TCDD and TCLI are required to prevent damage to the LHC in case of serious injection failures, in particular of the MKI injection kicker. A detailed particle tracking, taking realistic mechanical, positioning, injection, closed orbit and local optical errors into account, has been used to determine the required settings of the absorber elements to guarantee protection against different MKI failure modes. The expected protection level of the combination of TDI with TCLI, with the new TCLI layout, is presented. Conclusions are drawn concerning the expected damage risk level. CC-BY publication JACoW CERN EDS SIS EPAC04-2005 SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings CERN injection CERN insertion CERN kicker CERN proton CERN simulation ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable Brüning, Oliver Sim Ducimetière, L Goddard, B AUTHOR|(CDS)2108505 #BEARD# Lamont, M Mertens, V LHC CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-746 http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhcproj-2004-746 Access to fulltext document https://accelconf.web.cern.ch/e04/PAPERS/MOPLT022.PDF Published version from JACoW http://cds.cern.ch/record/788781/files/lhc-project-report-746.pdf Access to fulltext document Lidia.Ghilardi@cern.ch CERN n 200435 a2005 13 20100901 1606 CER01 20040817 646094 584 lucerne20040705 PUBLIC 002479183CER ARTICLE ConferencePaper 0001